Furnace



Jan- `1, 193,5- R. M. HARDGRovE 1,986,665

vFURNACE Filed Aug. 13. 195o 2 sheets-sheet;

FIG

Filed ug. 13, 1930 2 Sheets-Sheet 2 6 FIGB. J2

f' ATTORNEY5 roamed im. l1.11935 I i e 1,986,665 f UNITED vSTATES-j PATENT OFFICE .FUBNACE l y' Ralph lM. Hardgrove, Bethlehem, Pa., assigner to Fuller Lehigh Company, Fullerton, Pa., a corporation of Delaware y Appuoduon August is, Isso, sorua No. 415,010 `-`14c1oims. (Cl. 12s-zas) 'I'his invention relates to a furnace that is the header 12. Tubes 14 extend from the water especially adapted for burning powdered fuel in space of the steam and water drum 10 to the y which slag from the fuel is permitted to collect lowest portions of the' header 12 and tubes 15 upon the floor of the furnace in a molten form extend from the highest portions of the header 13 i and is drawn off at intervals. to the steam space of the steam and water drum 5 `1in furnaces of this character that. have been 10. A row of straight, parallel inclined floor used heretofore, troubles have arisen because of t tubes 16 extends across the lower portion of the the slag freezing and subsequently .expanding furnace from the header 12 to the header 13 in when again heated, with the result that the fursuch a manner as to form a plurality of inclined nooo Walls are pushed outwardly. This danser valleys along the door of the furnace, the tubes 10 l5 by successive heating and cooling. group' lies and the headers have a section in the In the drawings, reference character 1 indifurnace and the lowest portions of the valleys is sometimes caused because when the slag cools 16 passing'between the tubes 3 in the furnaceV and freezes, cracks formin it which subsequently walls. The floor tubes 16 comprise groups of receive more molten slagt that hardens therein, sloping parallel tubes, each group lying in a thus causing the slag slab to grow and expand plane intersecting that in which an adjacent BY th Present invention, the danger of the 'plane of each group of tubes to which the memwalls of the furnace being forced outwardly is bers of that group areconnected. A layer of obviated by so shaping the floor that the slag tile or Bailey blocks 17 is placed upon the vtubes that oollooiis Pon the oolhos 8- thin edgeiiht 16 to provide a continuous floor for the furnace. 20 would be crushed before thrusting the furnace slag tap noxes 1s are provided through the' front 20 Walls out. The ool' i5 Shaped S0 aS to have wall of the furnace at the lower ends of the val- SloPin valleys in which the S188 collectsleys formed by the floor of the furnace. Slag 19 The invention will be understood from the deis shown collected in the lowest portions of the scription in connection with the accompanying valleys on the floor of the furnace with theedges 26 drawings. in which Fis. 1 is a vertical section and sides of the layers thinned out as indicated 25 through an illustrativoombodment of the inven most clearly in Figs. 1 and 2 of the drawings. tion; F18. 2 i5 a Section along the line 2-2 of The highest elevation of the floor between the F18- 1', and Fig. 3 is a horizontal section through side walls of the furnace is indicated by the slopthe furnace along the line 3-3 of Fig. l. ing une 20 extending through the middle of the "cates a furnace that is provided with one or more are indicated by the lines 2l.

fuel burners 2 in the front wall thereof. The The side walls of the furnace are. cooled by front and r'ear walls of the furnace are provided water passing from the water-"space of the steam with vertically disposed water tubes 3 and the and water drum 1o through the tubes 9 into the .Side Walls 0f the furnace are provided withvverheaders 6, thence: upwardly through the .tubes 3 35 tioily disposed Water tubes 4 The tubes 3 and and 4 into the headers '1 and tubes 11 into the 4 are lined with tile orl the well-known Bailey drum 10. Recircuhtmg water also passes from y blocks to form continuous walls. The lower ends h Ad 6 The am that or the tubes s and 4 extend straight downwardly gmazdigzugatsmm n is item 40 into lower horizontal headers 6 and the upper for the most part ends of these tubes are bent outwardly and extend into horizontally disposed headers 7. Recir- The gmohhvgngcsood by wa h 1 7 P V gililtiscilegoifultl ifurnaconcleeczvxitilllsf dem 6 angl water drum 10 through the tubes 14 into the Tubes 9 extend from the water space of the header lmthen thmugh the tubes 16 to the 45 steam and water drum 10 gf the b01191- that is header 13 from which steam or a mixture of located `above the furnace, to the lower headers Stoom ond Water P88508 through the hlbes 15 to 6 and tubes l1 extend from the upper headers? the Stoom Simo@ of the Steam and Water drum 10- to the steam space of the steam and water drum t Itvhas been found that even if the oor of the .10.. A lower header .12 comprising at least two furnace is not liquid tight at the beginning, the 50 sections in its longitudinal dimension and here molten slag from the fuel freezes when it comes shown as being of zigzag shape is located on one in contact with the floor and fills up the crevices, side of the furnace near the bottom thereof, and so that a liquid-tight floor as well as liquid-tight a similar header 13'is located on the other side joints between the edges of the floor andthe of the furnace at' a slightly higher elevation than walls of the f be maintained. 55

and a header to which said tubes are connected,

the header comprising a plurality of sections in its longitudinal dimension, each-section lying in the plane of o ne group of tubes, said contiguous groups providing uniform cooling of the floor from wall to wall. ,1, g" 2. In a furnace, a slag tight floor -for retaining molten slag, contiguous groups of sloping parallel tubes in said oor, eachgroup lying in a p lane intersecting that in which an adjacent group lies, anda zigzag header to which the tubes are connected, said header havingxal section in the plane of each group of tubes, said 'contiguous groups tproviding uniform cooling of the iioor from twall o wall.

3. In a furnace for'burning a slag forming fuel, a slag retaining sloping floor holding a body of molten slag comprising contiguous groups of' lon gitudinally inclined tubes, each group lying in a plane intersecting that in which an adjacent group liesy and parallel to the intersection, saidJ contiguous groups providing uniform coolingof the oor from wall to wall.

4. In a furnace for burning a slag forming fuel, a slag retaining sloping -fioor holding a body of molten slag comprising contiguous groups of sloping tubes, each group .lying in a plane intersecting that-,in which an adjacent group lies and parallel to the intersection, an'd a slag tap opening adjacent the lower end oi the intersection,- said contiguous groups providing uniform cooling of the floorfroirrwall to wall.

5. In a furnace for burning a slag-forming fuel, a furnace bottomincluding closely arranged 40 .cooling tubes and constructed to retain molten slag, said tubes being divided into a plurality-'of groups extending 'transversely from wall to wall of said furnace and arranged in intersecting planes with the line of intersection of said planes extending parallel to said tubes, said groups being completely coextensive with -the bottom area supporting the molten slag, and means for supplying cooling fluid tosaid tubes;

- '6. In a furnace for -burning a slag-forming fuel, a furnace bottom including closely arranged inclined cooling tubes `and constructed to retain molten slag, means for supplying cooling fluid to the tubes, said tubes-extending in single lengths from wall to wall of' said furnace and u )being divided into a plurality of groups arranged in planes intersecting. at an obtuse angle forming a depression collecting molten slag, anda slag tap opening from saiddepressioni@ 7. In a furnace for burning a slag-forming fuel, a furnace bottom constructed'to`retain molten slag and arranged with a plurality. of valleys thereon, a plurality of horizontally inclined'water cooling tubes constructed to support the floor, said tubes having their longitudinal -axes "sub- 65 istantially parallel to the axes of 'said valleys.

8. In a furnace for burning a slagforming fuel, a furnace bottom'const'ructed to' retain molten slag and arranged with l thereon, a plurality of horizontally inclined water 70y cooling tubes adapted to support the floor, Said a plurality vof valleysv tubes having their` longitudinal axes substantially parallel to the axes of said valleys, upright water cooled walls adjacent said oor, said walls being formed with slag tap openings at the lower ends of said valleys.. 6

9. In a furnace for burning'a slag-forming fuel, a furnace bottom constructed to retain molten slag, Said furnacehbottom comprising contiguousA groups of inclined ,spaced water cooling tubes arranged in a plurality of planes intersectl0 ing along a line extending longitudinally of said tubes, said groups being completely coextensive withthe bottom area supporting the molten slag.

10. In a furnace for. burning a slag-forming fuel, a furnace bottom constructed to retain molten slag, said furnace bottom comprising contiguous groups of inclined spacedfwater cooling tubes arranged in a plurality of planes intersecting along a line extending longitudinally of said tubes, and being completely coextensive with 20 the area supporting the molten slag, an inclined hader connected to the upper ends of each group of said tubes,l and discharge connections from said.v headers near the high points thereof.

11. In a furnace for burning a" slag-forming fuel, a furnacebottom -constructed td retain molten slag, said' furnace bottom comprising conv tiguous groups o f inclined spaced cooling tubesv arranged in a plurality of intersecting planes and closure elements for "the tube spaces forming an inclined valley extending. .longitudinally of said tubes, said groups being completely coextensive with the bottom area supporting the molten slag, upright furnace lwalls comprising cooling tubes adjacent said floor at the lower end of said Valley, 35 said wall being formed with a slag tap opening.

12. In a boiler furnace for burning a slag" forming fuel, a steam boiler, four bottom sup-i -ported upwardly extending furnace side walls comprising spaced tubes connected at their ends 40 to headers and heat resisting elements closing' the spaces between the tubes, headers connected to said tubes at their upper and lower ends, means connecting said headers into the circulation ofthe boiler, a furnace bottomconstructed to retain a pool of molten slag and including horizontally inclined tubes-extending across the furnace and passing between the tubes of two opposite side walls in a single length, headers connected to the upper and lower ends of said inclined tubes, and means connecting said last mentioned headers into thev circulation of thev boiler independent of A means connecting the rst mentioned headers to the boiler.

13. In a furnace, a oor, wall tubes on all sides of the furnace chamber surrounding and defining the limits of said floor, circulation systems for passing a cooling iiuid throughsa'ld wall tubes,

the limits\of said floor, circulation systems for passing acooling fluid through'said wall tubes,

sloping tubes in said iioor, and aseparate circulavtion system4 for passing cooling uid upwardly through'said floor tubes.

alum-:i M. iraniani?,OVE. 

